Process of manufacturing blades for drawing pens



K. AKASHI.

PROCESS OF MANUFACTURING BLADES FOR DRAWING PENS.

APPLICATION FILED SEPT. 2. 1921.

1,402,034. Patented Jan. 3, 1922.

UNETEE KAZUE AKASHI, OF ASAK'USA-KU, TOKYO, JAPAN.

PROCESS OF MANUFACTURING- BLADES FOE DRAWING PENS.

Application filed September 2, 1921.

T 0 all whom it may concern Be it known that KAZUn Armsin, a subject of the Emperor of Japan, residing at No. 2 Shichikencho, Asakusa-ku, Tokyo, Japan, has invented certain new and useful Improvements in a Process of Manufacturing Blades for Drawing Pens, of which the following is a specification.

This invention relates to a process of manufacturing drawing pens, and more especially to manufacturing steel or other metallic blades of which a drawing pen can be composed, and consists in suitably bending one end of a strip of steel with segmental section in such a direction as will make the flat side concave, and in removing the metal which lies above the plane in elongation of the flat side of the bar.

The accompanying drawings show steps of the process, and in which Fig. 1 shows the shape of the stock of which the pen blade is to be made.

Fig. 2 shows the above stock bent.

In Fig. 3, (a) shows the cross section, (b) the elevation, and (c) the plan of the stock, and the hatched portion shows the metal to be removed.

Fig. l is same as Fig. 3, but with a somewhat different shaped section.

The stock of which the blade of the pen is to be made is a steel strip whose section is segmental, or more fully, is composed of a straight side and a curved side, the shape of the curve being a sector of an are or something like that. Such a strip 01' tape of steel can be manufactured at a low cost by the drawing process, and then cut to required length. One end of the stock is then bent upward, or in such a direction as will make the flat side concave, as shown in Fig. 2. This can be done by a press between a pair of bending dies.

Specification of Letters Patent.

Patented J an. 3, 1922.

Serial No. 498,063.

Then the metal which lies above the plane of the fiat side of the stock, shown by hatched lines in Fig. 3, is removed either by milling or by grinding, or by any other suitable process. There will then be left a metal stock with tongue shaped contoun' This is a shape suitable as a blade of a drawing pen. The contour of the pen blade can be made of any shape or proportions by changing the form of the section of the stock, or by the way the end of the bar is bent. Fig. 4 illustrates how we can get a blade more slender than that shown in Fig. 3.

In the process stated above, the required contour of the blade can be turned out by merely removing the metal of a bent steel strip along a straight plane, and there is no use working on the curved side of the blade.

From above it will be clear that the manufacture of the drawing pen blade has been exceedingly simplified, since it can be accomplished by the following simple mechanical processes 1. Preparing a long segmental strip of steel by drawing through dies.

2. Cutting off and bending by press.

3. Milling or grinding off the surplus metal along a straight plane.

Claim Process of manufacturing metallic blades for drawing pen, consisting in bending one end of a segmental strip of metalto a suitable curvature, and removing the portion which lies above the plane in elongation of the flat side of the strip, substantialy as described and shown.

In testimony whereof he affixes his signature.

KAZUE AKASHI. 

